Hey FrankoNice writeup on a great project. You should swap steps three and four on the post since you obviously drilled the holes before you painted which is critical advice for protecting all the metal. I will be trying this method in the future. It's a great use of old gutters. I thought of something similar using old gutter for a hydroponic flow system by adding some kind of aluminum cap and connecting runs vertically with pipe to have a gravity flow system with a pump in a vessel at the bottom.CheersBob